<template>
  <div id="app">
    <router-view />
  </div>
</template>

<script>
export default {
  created() {
    // 在页面加载时读取sessionStorage里的状态信息
    if (sessionStorage.getItem('store')) {
      this.$store.replaceState(
          Object.assign(
              {},
              this.$store.state,
              JSON.parse(sessionStorage.getItem('store'))
          )
      )
    }

    // 在页面刷新时将vuex里的信息保存到sessionStorage里
    // beforeunload事件在页面刷新时先触发
    window.addEventListener('beforeunload', () => {
      sessionStorage.setItem('store', JSON.stringify(this.$store.state))
    })
  },
  mounted() {
    console.log('当前用户：', this.$store.state.user)
  },
};
</script>

<style>
@import "./assets/css/normalize.css";
@import "./assets/css/theme.css";
#app {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: #303133;
}

#nav {
  padding: 30px;
}

#nav a {
  font-weight: bold;
  color: #303133;
}

#nav a.router-link-exact-active {
  color: #42b983;
}
</style>
